Move CI to GitHub Actions (#30)

* Port workflows from CircleCI to GitHub Actions
* Add CI job for workflow linting
* Update README badge

---------

Signed-off-by: Spencer Wilson <[email protected]>

Author: SWilson4

.circleci/config.yml

@@ -0,0 +1,47 @@
+name: liboqs-java CI
+
+on:
+  push:
+    branches: ["**"]
+  pull_request:
+    branches: ["**"]
+  repository_dispatch:
+    types: ["**"]
+
+jobs:
+  workflowcheck:
+    name: Check validity of GitHub workflows
+    runs-on: ubuntu-latest
+    container: openquantumsafe/ci-ubuntu-latest:latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # pin@v4
+      - name: Ensure GitHub actions are valid
+        run: actionlint -shellcheck "" # run *without* shellcheck
+
+  build-and-test:
+    needs: workflowcheck
+    name: OQS Ubuntu
+    runs-on: ubuntu-latest
+    container: openquantumsafe/ci-ubuntu-focal:latest
+    steps:
+      - name: Checkout liboqs-java
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # pin@v4
+      - name: Checkout liboqs main
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # pin@v4
+        with:
+          repository: open-quantum-safe/liboqs
+          path: liboqs
+          ref: main
+      - name: Build liboqs
+        run: mkdir build && cd build && cmake .. -G"Ninja" -DBUILD_SHARED_LIBS=ON -DOQS_BUILD_ONLY_LIB=ON && ninja install
+        working-directory: liboqs
+      - name: Resolve all maven project dependencies
+        run: mvn dependency:go-offline
+      - name: Build liboqs-java and run tests
+        run: export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/usr/local/lib" && mvn package
+      - name: Compile KEM, Signatures and Rand examples
+        run: |
+          javac -cp target/liboqs-java.jar examples/KEMExample.java &&
+          javac -cp target/liboqs-java.jar examples/SigExample.java &&
+          javac -cp target/liboqs-java.jar examples/RandExample.java

.github/workflows/java.yml

@@ -1,4 +1,4 @@
-[![CircleCI Build Status](https://circleci.com/gh/open-quantum-safe/liboqs-java/tree/master.svg?style=svg)](https://circleci.com/gh/open-quantum-safe/liboqs-java/tree/master)
+[![GitHub Actions Build Status](https://github.com/open-quantum-safe/liboqs-java/actions/workflows/java.yml/badge.svg)](https://github.com/open-quantum-safe/liboqs-java/actions/workflows/java.yml)
 
 # liboqs-java: Java wrapper for liboqs